Starting September 11, 2026, southbound Interstate 5 through Portland’s Rose Quarter will not be a normal commute. The Oregon Department of Transportation plans to close all southbound lanes between Interstate 405 and Interstate 84 around the clock for up to five weeks while crews repair and resurface an elevated structure near the Moda Center.
That is not a single overnight paving night. It is a multi-week, 24-hour detour regime that can double or triple travel times, push congestion into Vancouver, Washington, and force hotel, airport, event, and freight plans onto I-405, I-205, or other modes before Labor Day travel even begins.
- What closes: All I-5 southbound lanes in the Rose Quarter between I-405 and I-84.
- When: Starting September 11, 2026, 24 hours a day, up to five weeks.
- Why: Structural repairs, deck resurfacing, bridge joints, and related safety work.
- Main detour: Most southbound traffic routes to I-405 southbound; regional traffic to I-205.
- Local access: One lane toward Broadway and Weidler stays open for downtown and venue access.
What the project team put on the record
According to the official I-5 Rose Quarter Construction Travel Impacts page, the southbound closure begins September 11, 2026, and runs 24 hours a day, seven days a week, for up to five weeks. Crews will repair and reinforce weak areas, replace bridge joints, repave the surface, and repaint lane lines. Travel times may take two to three times longer than usual, and congestion could back up across the Columbia River into Washington and onto local Portland streets.
Drivers can expect I-5 southbound closed between I-405 and I-84, with southbound travel detoured to I-405 southbound and regional traffic directed to I-205. One lane to the Broadway and Weidler exit remains open for local and event-center access. On-ramps from Greeley, from I-405 northbound and the Fremont Bridge, and from the Moda Center to I-5 southbound close. The I-5 southbound ramp to I-84 eastbound closes. I-84 westbound to I-5 southbound stays open, and I-5 northbound remains open.
ODOT’s project page for the I-5 Rose Quarter Improvement Project restates the same September 11 start, the around-the-clock duration of up to five weeks, and the one-lane local access from the I-405 junction toward Broadway and Weidler. That page frames the work as part of a larger construction phase scheduled to continue through late 2026, so the five-week southbound closure sits inside a longer corridor rebuild rather than as a one-off surprise.
Independent coverage from The Columbian has already warned Vancouver, Washington, officials and commuters that the same closure can double or triple travel times between Vancouver and Portland and that congestion may extend across the Columbia River. That is the regional signal for hotel guests, airport runs to PDX, and freight that still treat I-5 as the default spine.
Who needs a new plan before September 11
Weekday Vancouver-to-Portland commuters feel it first. If your office, hospital shift, or school run relies on southbound I-5 through the Rose Quarter, the project team is asking you to change time, mode, or route rather than wait in a doubled queue. Freight and long-distance drivers are steered toward I-205 for regional through trips so local streets and the I-405 detour do not absorb every truck at once.
Moda Center event nights and Oregon Convention Center calendars also change. One southbound lane toward Broadway and Weidler remains for local and venue access, but that is not the same as free-flowing I-5. If you hold tickets for a game or concert during the five-week window, leave earlier, confirm the signed approach, and expect rideshare prices to rise when the freeway is constrained.
Hotel guests north of the river and in downtown Portland need different airport math. PDX sits north of the core; many southbound returns after a trip still pass the Rose Quarter system. Build the detour into shuttle, rental-car, and rideshare timing now, not on the day the app shows a red line from the Columbia River to I-84.
Travelers using Portland as a base for the Columbia River Gorge should treat the September window as a routing constraint on the I-5 side of the trip. Deep Arrival’s Hood River RV parks and campgrounds guide helps re-base nights east of the city once you clear the metro freeways, but it does not remove the need for an I-405 or I-205 plan on the days you enter or leave Portland.
How the detour is supposed to work
Most I-5 southbound traffic is sent to I-405 southbound. Downtown-bound drivers can use the remaining local lane toward Broadway and Weidler near the Moda Center. Regional through traffic is told to take I-205. I-5 northbound stays open, which matters for return legs and for anyone who can reverse a trip pair to avoid the closed direction.
On-ramp closures matter as much as the mainline. If your usual merge is Greeley, the Fremont Bridge path from I-405 northbound, or the Moda Center ramp onto I-5 southbound, that entrance is closed during the window. Rehearse the signed detour on a map before the first closed morning rather than inventing a neighborhood cut-through that dumps you onto a blocked gore.
ODOT has said the continuous five-week closure is cheaper, faster, and safer for workers than months of weekend or single-lane patterns. For travelers, the trade is concentrated pain instead of drip pain. Use that framing when you decide whether to move a September appointment, book a different hotel side of the river, or shift a freight pickup outside peak hours.
The project also lists shorter overnight and local street work already active in August, including intermittent southbound right-lane nights near the Morrison Bridge and other staging moves. Treat those as early warnings, not as substitutes for the September main event. The September southbound full closure is the trip-planning wall.
What to do in the next few weeks
Mark September 11 on every shared calendar that touches Portland. If you can move a medical visit, client meeting, or warehouse drop outside the five-week block, do it while other people’s calendars are still flexible. If you cannot move it, choose an earlier departure, a transit option, or a remote day before the first closed morning.
For through trips, prefer I-205 when the project team’s regional guidance applies, and leave extra time even on that alternate. For downtown access, practice the Broadway and Weidler approach and confirm event parking instructions from the venue, not only from a generic map app.
Sign up for project alerts on the I-5 Rose Quarter site and check TripCheck for live conditions once the window opens. The five-week clock can end earlier if work finishes early, but you should not plan as if it will. Assume the full window until the project team posts a reopen notice.
If your wider trip continues toward Vancouver-area history stops after the freeway mess, Fort Vancouver National Historic Site remains a useful half-day plan on the Washington side without requiring the closed southbound lanes. Pair that with a honest buffer on any Portland return that still needs I-5 or I-405.
| If you | What to do |
|---|---|
| Commute Vancouver to Portland southbound | Shift time or mode; expect two to three times longer trips if you keep the old pattern. |
| Drive long distance through the metro | Prefer I-205 for regional through trips and leave earlier than usual. |
| Need downtown or Moda Center access | Use the remaining Broadway and Weidler lane and follow signed local approaches. |
| Hold a mid-September PDX trip | Rebuild airport shuttles and hotel returns around I-405 or I-205, not open I-5 southbound. |
| Can move appointments | Reschedule into August or after the reopen notice rather than mid-window peak hours. |
- Calendar wall: Treat September 11 as the hard start for the multi-week southbound blackout.
- Detour choice: I-405 for most southbound traffic; I-205 for regional through trips.
- Local access: Broadway and Weidler remain for downtown and venue approaches only.
- Cross-river risk: Expect queues into Vancouver and onto local Portland streets.
- Alert habit: Use project alerts and TripCheck once the window opens, not only social posts.
Rebuild any September Portland itinerary that assumed open I-5 southbound through the Rose Quarter. The clean next step is to pick I-405 or I-205, move what you can off the five-week window, and leave earlier for everything that cannot move.
When does the full southbound closure start?
ODOT and the project site list September 11, 2026, as the start of the around-the-clock southbound closure for up to five weeks.
Is I-5 northbound also closed?
No. Project materials state that I-5 northbound remains open during the southbound full closure window.
How do I reach downtown during the closure?
One southbound lane toward Broadway and Weidler remains for local and event-center access. Most other southbound traffic is detoured to I-405.
Will travel times really double or triple?
ODOT predicts travel times near the site can be two to three times longer if drivers keep normal patterns. Actual times will vary by hour and by how many people shift routes.
